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linux-mm@kvack.org, mhocko@suse.com, vbabka@suse.cz, edumazet@google.com, longman@redhat.com, surenb@google.com, elver@google.com, glider@google.com Content-Type: text/plain; charset="UTF-8" X-Rspamd-Queue-Id: 94270160006 X-Stat-Signature: aq4qz9rg85qj9z753pw8d38rzeb91xmw X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1681800838-490542 X-HE-Meta: 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 eaQs7FqI 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Tue, 18 Apr 2023 at 08:10, Dmitry Vyukov wrote: > > On Tue, 18 Apr 2023 at 06:10, hoyoung seo wrote: > > > > > -----Original Message----- > > > From: Dmitry Vyukov > > > Sent: Monday, April 17, 2023 3:20 PM > > > To: SEO HOYOUNG > > > Cc: andreyknvl@gmail.com; osalvador@suse.de; akpm@linux-foundation.org; > > > linux-kernel@vger.kernel.org; linux-mm@kvack.org; mhocko@suse.com; > > > vbabka@suse.cz; edumazet@google.com; longman@redhat.com; surenb@google.com; > > > elver@google.com; glider@google.com > > > Subject: Re: [PATCH v1] lib/stackdepot: limit nr_entries size > > > > > > On Mon, 17 Apr 2023 at 07:16, SEO HOYOUNG wrote: > > > > > > > > While using the MCQ feature of UFS, dump stack was detected very deeply. > > > > If this continues to happen, depot_alloc_stack() will continue to > > > > exceed STACK_ALLOC_SIZE and STACK_ALLOC_MAX_SLABS, eventually > > > > resulting in the warning "Stack depot reached limit capacity". > > > > > > > > So want to limit the size of entries stored in it. > > > > 25 is a test value, and we found that in a normal case, the depth of > > > > the stack does not exceed 25. > > > > > > > > [ 2479.383395]I[0:launcher-loader: 1719] Stack depot reached limit > > > > capacity [ 2479.383538]I[0:launcher-loader: 1719] WARNING: CPU: 0 PID: > > > > 1719 at lib/stackdepot.c:129 __stack_depot_save+0x464/0x46c [ > > > > 2479.385693]I[0:launcher-loader: 1719] pstate: 624000c5 (nZCv daIF > > > > +PAN -UAO +TCO -DIT -SSBS BTYPE=--) [ 2479.385724]I[0:launcher-loader: > > > > 1719] pc : __stack_depot_save+0x464/0x46c [ > > > > 2479.385751]I[0:launcher-loader: 1719] lr : > > > > __stack_depot_save+0x460/0x46c [ 2479.385774]I[0:launcher-loader: > > > > 1719] sp : ffffffc0080073c0 [ 2479.385793]I[0:launcher-loader: 1719] > > > > x29: ffffffc0080073e0 x28: ffffffd00b78a000 x27: 0000000000000000 [ > > > > 2479.385839]I[0:launcher-loader: 1719] x26: 000000000004d1dd x25: > > > > ffffff891474f000 x24: 00000000ca64d1dd [ > > > > 2479.385882]I[0:launcher-loader: 1719] x23: 0000000000000200 x22: > > > > 0000000000000220 x21: 0000000000000040 [ > > > > 2479.385925]I[0:launcher-loader: 1719] x20: ffffffc008007440 x19: > > > > 0000000000000000 x18: 0000000000000000 [ > > > > 2479.385969]I[0:launcher-loader: 1719] x17: 2065726568207475 x16: > > > 000000000000005e x15: 2d2d2d2d2d2d2d20 [ 2479.386013]I[0:launcher-loader: > > > 1719] x14: 5d39313731203a72 x13: 00000000002f6b30 x12: 00000000002f6af8 > > > [ 2479.386057]I[0:launcher-loader: 1719] x11: 00000000ffffffff x10: > > > ffffffb90aacf000 x9 : e8a74a6c16008800 [ 2479.386101]I[0:launcher-loader: > > > 1719] x8 : e8a74a6c16008800 x7 : 00000000002f6b30 x6 : 00000000002f6af8 > > > [ 2479.386145]I[0:launcher-loader: 1719] x5 : ffffffc0080070c8 x4 : > > > ffffffd00b192380 x3 : ffffffd0092b313c [ 2479.386189]I[0:launcher-loader: > > > 1719] x2 : 0000000000000001 x1 : 0000000000000004 x0 : 0000000000000022 > > > [ 2479.386231]I[0:launcher-loader: 1719] Call trace: > > > > [ 2479.386248]I[0:launcher-loader: 1719] > > > > __stack_depot_save+0x464/0x46c [ 2479.386273]I[0:launcher-loader: > > > > 1719] kasan_save_stack+0x58/0x70 [ 2479.386303]I[0:launcher-loader: > > > > 1719] save_stack_info+0x34/0x138 [ 2479.386331]I[0:launcher-loader: > > > > 1719] kasan_save_free_info+0x18/0x24 [ > > > > 2479.386358]I[0:launcher-loader: 1719] > > > > ____kasan_slab_free+0x16c/0x170 [ 2479.386385]I[0:launcher-loader: > > > > 1719] __kasan_slab_free+0x10/0x20 [ 2479.386410]I[0:launcher-loader: > > > > 1719] kmem_cache_free+0x238/0x53c [ 2479.386435]I[0:launcher-loader: > > > > 1719] mempool_free_slab+0x1c/0x28 [ 2479.386460]I[0:launcher-loader: > > > > 1719] mempool_free+0x7c/0x1a0 [ 2479.386484]I[0:launcher-loader: > > > > 1719] bvec_free+0x34/0x80 [ 2479.386514]I[0:launcher-loader: 1719] > > > > bio_free+0x60/0x98 [ 2479.386540]I[0:launcher-loader: 1719] > > > > bio_put+0x50/0x21c [ 2479.386567]I[0:launcher-loader: 1719] > > > > f2fs_write_end_io+0x4ac/0x4d0 [ 2479.386594]I[0:launcher-loader: 1719] > > > > bio_endio+0x2dc/0x300 [ 2479.386622]I[0:launcher-loader: 1719] > > > > __dm_io_complete+0x324/0x37c [ 2479.386650]I[0:launcher-loader: 1719] > > > > dm_io_dec_pending+0x60/0xa4 [ 2479.386676]I[0:launcher-loader: 1719] > > > > clone_endio+0xf8/0x2f0 [ 2479.386700]I[0:launcher-loader: 1719] > > > > bio_endio+0x2dc/0x300 [ 2479.386727]I[0:launcher-loader: 1719] > > > > blk_update_request+0x258/0x63c [ 2479.386754]I[0:launcher-loader: > > > > 1719] scsi_end_request+0x50/0x304 [ 2479.386782]I[0:launcher-loader: > > > > 1719] scsi_io_completion+0x88/0x160 [ > > > > 2479.386808]I[0:launcher-loader: 1719] > > > > scsi_finish_command+0x17c/0x194 [ 2479.386833]I[0:launcher-loader: > > > > 1719] scsi_complete+0xcc/0x158 [ 2479.386859]I[0:launcher-loader: > > > > 1719] blk_mq_complete_request+0x4c/0x5c [ > > > > 2479.386885]I[0:launcher-loader: 1719] scsi_done_internal+0xf4/0x1e0 > > > > [ 2479.386910]I[0:launcher-loader: 1719] scsi_done+0x14/0x20 [ > > > > 2479.386935]I[0:launcher-loader: 1719] > > > > ufshcd_compl_one_cqe+0x578/0x71c [ 2479.386963]I[0:launcher-loader: > > > > 1719] ufshcd_mcq_poll_cqe_nolock+0xc8/0x150 > > > > [ 2479.386991]I[0:launcher-loader: 1719] ufshcd_intr+0x868/0xc0c [ > > > > 2479.387017]I[0:launcher-loader: 1719] > > > > __handle_irq_event_percpu+0xd0/0x348 > > > > [ 2479.387044]I[0:launcher-loader: 1719] > > > > handle_irq_event_percpu+0x24/0x74 [ 2479.387068]I[0:launcher-loader: > > > > 1719] handle_irq_event+0x74/0xe0 [ 2479.387091]I[0:launcher-loader: > > > > 1719] handle_fasteoi_irq+0x174/0x240 [ > > > > 2479.387118]I[0:launcher-loader: 1719] handle_irq_desc+0x7c/0x2c0 [ > > > > 2479.387147]I[0:launcher-loader: 1719] > > > > generic_handle_domain_irq+0x1c/0x28 > > > > [ 2479.387174]I[0:launcher-loader: 1719] gic_handle_irq+0x64/0x158 [ > > > > 2479.387204]I[0:launcher-loader: 1719] call_on_irq_stack+0x2c/0x54 [ > > > > 2479.387231]I[0:launcher-loader: 1719] do_interrupt_handler+0x70/0xa0 > > > > [ 2479.387258]I[0:launcher-loader: 1719] el1_interrupt+0x34/0x68 [ > > > > 2479.387283]I[0:launcher-loader: 1719] el1h_64_irq_handler+0x18/0x24 > > > > [ 2479.387308]I[0:launcher-loader: 1719] el1h_64_irq+0x68/0x6c [ > > > > 2479.387332]I[0:launcher-loader: 1719] > > > > blk_attempt_bio_merge+0x8/0x170 [ 2479.387356]I[0:launcher-loader: > > > > 1719] blk_mq_attempt_bio_merge+0x78/0x98 > > > > [ 2479.387383]I[0:launcher-loader: 1719] > > > > blk_mq_submit_bio+0x324/0xa40 [ 2479.387409]I[0:launcher-loader: 1719] > > > > __submit_bio+0x104/0x138 [ 2479.387436]I[0:launcher-loader: 1719] > > > > submit_bio_noacct_nocheck+0x1d0/0x4a0 > > > > [ 2479.387462]I[0:launcher-loader: 1719] > > > > submit_bio_noacct+0x618/0x804 [ 2479.387487]I[0:launcher-loader: 1719] > > > > submit_bio+0x164/0x180 [ 2479.387511]I[0:launcher-loader: 1719] > > > > f2fs_submit_read_bio+0xe4/0x1c4 [ 2479.387537]I[0:launcher-loader: > > > > 1719] f2fs_mpage_readpages+0x888/0xa4c [ > > > > 2479.387563]I[0:launcher-loader: 1719] f2fs_readahead+0xd4/0x19c [ > > > > 2479.387587]I[0:launcher-loader: 1719] read_pages+0xb0/0x4ac [ > > > > 2479.387614]I[0:launcher-loader: 1719] > > > > page_cache_ra_unbounded+0x238/0x288 > > > > [ 2479.387642]I[0:launcher-loader: 1719] do_page_cache_ra+0x60/0x6c [ > > > > 2479.387669]I[0:launcher-loader: 1719] > > > > page_cache_ra_order+0x318/0x364 [ 2479.387695]I[0:launcher-loader: > > > > 1719] ondemand_readahead+0x30c/0x3d8 [ > > > > 2479.387722]I[0:launcher-loader: 1719] page_cache_sync_ra+0xb4/0xc8 [ > > > > 2479.387749]I[0:launcher-loader: 1719] filemap_read+0x268/0xd24 [ > > > > 2479.387777]I[0:launcher-loader: 1719] > > > > f2fs_file_read_iter+0x1a0/0x62c [ 2479.387806]I[0:launcher-loader: > > > > 1719] vfs_read+0x258/0x34c [ 2479.387831]I[0:launcher-loader: 1719] > > > > ksys_pread64+0x8c/0xd0 [ 2479.387857]I[0:launcher-loader: 1719] > > > > __arm64_sys_pread64+0x48/0x54 [ 2479.387881]I[0:launcher-loader: 1719] > > > > invoke_syscall+0x58/0x158 [ 2479.387909]I[0:launcher-loader: 1719] > > > > el0_svc_common+0xf0/0x134 [ 2479.387935]I[0:launcher-loader: 1719] > > > > do_el0_svc+0x44/0x114 [ 2479.387961]I[0:launcher-loader: 1719] > > > > el0_svc+0x2c/0x80 [ 2479.387985]I[0:launcher-loader: 1719] > > > > el0t_64_sync_handler+0x48/0x114 [ 2479.388010]I[0:launcher-loader: 1719] > > > el0t_64_sync+0x190/0x194 [ 2479.388038]I[0:launcher-loader: 1719] Kernel > > > panic - not syncing: kernel: panic_on_warn set ... > > > > > > > > Signed-off-by: SEO HOYOUNG > > > > --- > > > > lib/stackdepot.c | 3 ++- > > > > 1 file changed, 2 insertions(+), 1 deletion(-) > > > > > > > > diff --git a/lib/stackdepot.c b/lib/stackdepot.c index > > > > 2f5aa851834e..f158729598a6 100644 > > > > --- a/lib/stackdepot.c > > > > +++ b/lib/stackdepot.c > > > > @@ -43,6 +43,7 @@ > > > > #define DEPOT_MAX_POOLS \ > > > > (((1LL << (DEPOT_POOL_INDEX_BITS)) < DEPOT_POOLS_CAP) ? \ > > > > (1LL << (DEPOT_POOL_INDEX_BITS)) : DEPOT_POOLS_CAP) > > > > +#define DEPO_MAX_DEPTH 25 > > > > > > > > /* Compact structure that stores a reference to a stack. */ union > > > > handle_parts { @@ -375,7 +376,7 @@ depot_stack_handle_t > > > > __stack_depot_save(unsigned long *entries, > > > > * filter_irq_stacks() to simplify all callers' use of stack depot. > > > > */ > > > > nr_entries = filter_irq_stacks(entries, nr_entries); > > > > - > > > > + nr_entries = nr_entries > DEPO_MAX_DEPTH ? DEPO_MAX_DEPTH : > > > > + nr_entries; > > > > if (unlikely(nr_entries == 0) || stack_depot_disabled) > > > > goto fast_exit; > > > > > > Hi SEO, > > > > > > The stack overflow errors are related to total number of stacks rather > > > than size of a single stack. > > > > > > filter_irq_stacks() is somehow not working in your case. It's supposed to > > > strip stacks somewhere around el1_interrupt (on interrupt entry), but it's > > > failing to do it. > > > As a result you are getting an effectively infinite amount of random > > > stacks saved. > > > > > > You need to debug why filter_irq_stacks() is failing in your case and fix > > > that instead. > > > > Hi Vyukov. > > > > Thanks your reply. > > As you say, the filter_irq_stacks() doesn't seem to be work correctly. > > I checked by print a symbol name, and it looks like the filter itself is wrong. > > __irqentry_text_start -> _stext+0x0/0x66c > > __irqentry_text_end -> _stext+0x0/0x66c > > > > __softirqentry_text_start -> _stext+0x0/0x66c > > __softirqentry_text_end -> __softirqentry_text_end+0x0/0x4 > > Do you have the symbol name you were originally expecting? > > > > The problem seems to be caused by not riding the call stack defined > > by __irqentry_text_start, __irqentry_text_end when h/w irq occurs in our driver. > > If you can tell us the call stack names defined by __irqentry_text_start, __irqentry_text_end, > > it will help us to solve the problem. > > These __irqentry_text_start/end markers should contain all irq entry functions. > > For example, for a random x86 kernel I see: > > $ nm -ngS vmlinux | grep -C 3 irqentry_text > ffffffff8aaeffc0 00000000000008d9 T __do_softirq > ffffffff8aaeffc0 T __kprobes_text_end > ffffffff8aaeffc0 T __kprobes_text_start > ffffffff8aaeffc0 T __softirqentry_text_start > ffffffff8aaf0899 T __softirqentry_text_end > ffffffff8aaf08a0 0000000000000008 T __SCT__tp_func_initcall_level > ffffffff8aaf08a0 T __static_call_text_start > ffffffff8aaf08a8 0000000000000008 T __SCT__tp_func_initcall_start > -- > ffffffff8ac0013f T entry_SYSRETQ_end > ffffffff8ac00140 0000000000000049 T xen_error_entry > ffffffff8ac00190 0000000000000cc0 T irq_entries_start > ffffffff8ac00190 T __irqentry_text_start > ffffffff8ac00e50 0000000000000140 T spurious_entries_start > ffffffff8ac00f90 000000000000001f T asm_exc_divide_error > ffffffff8ac00fb0 000000000000001f T asm_exc_overflow > -- > ffffffff8ac01570 000000000000001f T asm_sysvec_kvm_posted_intr_wakeup_ipi > ffffffff8ac01590 000000000000001f T asm_sysvec_kvm_posted_intr_nested_ipi > ffffffff8ac015b0 000000000000001f T asm_sysvec_kvm_asyncpf_interrupt > ffffffff8ac015d0 T __irqentry_text_end > ffffffff8ac015d0 T swapgs_restore_regs_and_return_to_usermode > ffffffff8ac01624 T restore_regs_and_return_to_kernel > ffffffff8ac01646 T native_irq_return_iret > > > So the __softirqentry_text_start/end range includes only __do_softirq symbol. > > And __irqentry_text_start/end includes asm_exc_divide_error, > asm_exc_overflow, etc. > > This looks reasonable. > > Now for a random arm64 kernel I see this: > > $ nm -nS vmlinux | grep -v "\$x" | grep -C 3 irqentry_text > ffff800008000008 t $d.1 > ffff800008010008 000000000000000c t __primary_entry_veneer > ffff800008020000 0000000000000158 t dw_apb_ictl_handle_irq > ffff800008020000 T __irqentry_text_start > ffff800008020000 T _stext > ffff80000802015c 0000000000000d2c T __do_softirq > ffff80000802015c T __irqentry_text_end > ffff80000802015c T __softirqentry_text_start > ffff800008020ebc T __entry_text_start > ffff800008020ebc T __softirqentry_text_end > ffff800008021000 0000000000000800 T vectors > ffff800008021800 000000000000007c t __bad_stack > ffff80000802187c 0000000000000068 t el1t_64_sync > > So the __softirqentry_text_start/end range also includes only > __do_softirq symbol. > > And __irqentry_text_start/end includes only dw_apb_ictl_handle_irq. > > I don't know if it's correct for arm64 kernel or not (are there other > irq entry points?). > > If you have other entry points, I think you need to mark them with > __irq_entry macro, which should place them in the section: > > https://elixir.bootlin.com/linux/latest/source/include/linux/interrupt.h#L829 > https://elixir.bootlin.com/linux/latest/A/ident/__irq_entry Found examples of proper cut points for irq/softirq for arm64 on syzbot: https://syzkaller.appspot.com/text?tag=CrashReport&x=131be6be880000 Freed by task 2264: kasan_save_stack+0x2c/0x60 mm/kasan/common.c:45 kasan_set_track+0x2c/0x40 mm/kasan/common.c:52 kasan_save_free_info+0x38/0x5c mm/kasan/generic.c:511 ____kasan_slab_free mm/kasan/common.c:236 [inline] ____kasan_slab_free+0x124/0x1f0 mm/kasan/common.c:200 __kasan_slab_free+0x18/0x24 mm/kasan/common.c:244 kasan_slab_free include/linux/kasan.h:177 [inline] slab_free_hook mm/slub.c:1724 [inline] slab_free_freelist_hook+0x9c/0x1bc mm/slub.c:1750 slab_free mm/slub.c:3661 [inline] __kmem_cache_free+0xa4/0x370 mm/slub.c:3674 kfree+0xdc/0x284 mm/slab_common.c:1007 rcu_free_wq+0x9c/0x10c kernel/workqueue.c:3531 rcu_do_batch kernel/rcu/tree.c:2250 [inline] rcu_core+0x874/0x1b50 kernel/rcu/tree.c:2510 rcu_core_si+0x10/0x1c kernel/rcu/tree.c:2527 _stext+0x28c/0x107c https://syzkaller.appspot.com/text?tag=CrashReport&x=1147006cc80000 Freed by task 21: ... skb_release_all net/core/skbuff.c:916 [inline] __kfree_skb net/core/skbuff.c:930 [inline] consume_skb+0xa4/0x17c net/core/skbuff.c:1098 mac80211_hwsim_tx_frame+0x1cc/0x1f8 drivers/net/wireless/mac80211_hwsim.c:2054 mac80211_hwsim_beacon_tx+0x4f0/0x8ec drivers/net/wireless/mac80211_hwsim.c:2116 __iterate_interfaces+0x204/0x460 net/mac80211/util.c:763 ieee80211_iterate_active_interfaces_atomic+0xb4/0x140 net/mac80211/util.c:799 mac80211_hwsim_beacon+0xcc/0x1c8 drivers/net/wireless/mac80211_hwsim.c:2142 __run_hrtimer kernel/time/hrtimer.c:1685 [inline] __hrtimer_run_queues+0x580/0x10a8 kernel/time/hrtimer.c:1749 hrtimer_run_softirq+0x158/0x220 kernel/time/hrt