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Mon, 23 Feb 2026 10:32:34 -0800 (PST) Date: Mon, 23 Feb 2026 10:32:34 -0800 X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <699c9d42.a00a0220.121a60.00ee.GAE@google.com> Subject: [syzbot] [mm?] WARNING in __put_task_struct (6) From: syzbot To: Liam.Howlett@oracle.com, akpm@linux-foundation.org, bsegall@google.com, david@kernel.org, dietmar.eggemann@arm.com, juri.lelli@redhat.com, kees@kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-usb@vger.kernel.org, lorenzo.stoakes@oracle.com, mgorman@suse.de, mhocko@suse.com, mingo@redhat.com, peterz@infradead.org, rostedt@goodmis.org, rppt@kernel.org, surenb@google.com, syzkaller-bugs@googlegroups.com, vbabka@suse.cz, vincent.guittot@linaro.org, vschneid@redhat.com Content-Type: text/plain; charset="UTF-8" X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 7754C140007 X-Stat-Signature: gtsdxm35tmgay1bxqgfqbxfefddnncyu X-Rspam-User: X-HE-Tag: 1771871555-209235 X-HE-Meta: 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 OHgFAVWM /31S5TTAwcS3bakaTmOtjFmXjy2r8W08FL/ctrXTJxDQ3uMNlMHx/Bh6oya1D+sYq1GHCV2iJ0J+82sJMUCrK0XtvRUIl6UVl3qLwlRK+pEyrPxN7mfIPC3qWRwKEw2IM43dS/oZkfB0Kv7+y8YN1uyhtxCgdbgdIJnEz0Uu5bvv83nM5MnolHLpsJzyYxmAuHgnYiI3R3PjFvlyOYzF2fSfoVd7RhngBH5uH7tUgdUs0ddGujWoGvkOP8ZSYu/E4dg8WNLsWBx7ixFQmc9+qWJg7KTjwazpbjZekStF1weWhjhDAZBJNBbFzXiDXQtxrwfvrqTw3mGwfF9BXYw7xPbeg6dUuBeTwki7+aQA5fZolA8+rHA6lTYY0up6LPwRQbqphF4K0+Ag2r/L40wkl5CK+i4YPCE6c39WUJpOAgIRSWJmgvzAXKBf0SHGglNzGKGR4yOVrFz1LRNuFjsxj1+ybfPGs4j9L5nJlazEblnXCVo9AvY3RpTc2BI7yZPKGAzPupWn27pryFQiPxFtsiXaKVcV71FASg6QwH+Jt67l+sTqq0hT98t8BBZUMorTkgjiLdTaNPw8yFO6taQ93TG7SkP8nEY6GzidFALNDNnyamamRcMusorXUia9d/1akqSGQHQEVAbk8bOXTrdQEaO06nvOkxYqyB7z+94g8U5EKQ0J7yPfbbdu5adzJ6FTuU8SLNxUnWDCJ/JRGCduMYGisx9h5LS4NUw1mu45g0jBzRLu1o3fyB6+oSI8KipwEiEy49JIS3OxUSR4z+H/86HDDdkzcfghWDjmXPqUUDjU8BMljMFTD0fuMuzFSQHUjCso7rMsmulKiT97ixK/GzSxEZpgXi81gtScxtVPNBu9N5F7waCEmw6j59DIjI8Me1fzsUKgbU7sfJb6hts9+zaL0dbSXCFbuMRUVLIfVUVihlYjAVj6noQamrCUjBIWSHgDey1sAJGbD/hiMBOGYs2TQCMXj fmvz/Sfg UD8gTRYfZz+2yQ8HxOqfmqZN4Z3INxOGlZGiZtBTbVNlV6ldAP6RoIwk3k6lamPI3K8v+Xhi1Xrnh4y3zIqEtjHvBIm2KANyR/OJwg1gMswesuVTKajqMhYuSkfaQGRflDBd/hvUgozgXfiEfzaDAUhDoHy3NgqPhmpnr1o7obySUziGybu8J+nI4BiGBXZh/pfhOia9TSItF5luUawCzv6lKndIIylNafuFkwuYhqgCxjY331xK8/SCNIkzTnj8yn64LFdltCFn9KiRx23A6h5/oe+FcA+hSZOFWL11yiDNWY5087qHZEH9lUZy+culMzqg2PK/HG55hAWtC7be5m2wXFSZTOXELCZGmxJq3dGi/Tt5wFoBkIFVVTU4m0A3+fBcmM8buDkYDDUW3zvwS9h1Z1qqM0HFyzj74PwR+tv0vu8GfapG+wY+9NboskoddYjtI6dBa8vKjAN3zq4dQfaci6r0sotQWdk1TqhNUi9goRQJUMcy9Ug0wA7MFwAF 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: List-Subscribe: List-Unsubscribe: Hello, syzbot found the following issue on: HEAD commit: 2b7a25df823d Merge tag 'mm-nonmm-stable-2026-02-18-19-56' .. git tree: https://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git usb-testing console output: https://syzkaller.appspot.com/x/log.txt?x=14573b3a580000 kernel config: https://syzkaller.appspot.com/x/.config?x=1ff39736314a9939 dashboard link: https://syzkaller.appspot.com/bug?extid=c978a74d4872e06c4928 compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/10a06102f92f/disk-2b7a25df.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/cb322de10b94/vmlinux-2b7a25df.xz kernel image: https://storage.googleapis.com/syzbot-assets/7a3e5e026b94/bzImage-2b7a25df.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+c978a74d4872e06c4928@syzkaller.appspotmail.com ------------[ cut here ]------------ refcount_read(&tsk->usage) WARNING: kernel/fork.c:779 at __put_task_struct+0x33c/0x400 kernel/fork.c:779, CPU#1: kworker/1:6/5227 Modules linked in: CPU: 1 UID: 0 PID: 5227 Comm: kworker/1:6 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2026 Workqueue: usb_hub_wq hub_event RIP: 0010:__put_task_struct+0x33c/0x400 kernel/fork.c:779 Code: 4c 89 e6 e8 b6 7e 98 00 e9 f2 fe ff ff e8 fc 7a 3d 00 be 03 00 00 00 4c 89 e7 e8 1f a0 57 01 e9 db fe ff ff e8 e5 7a 3d 00 90 <0f> 0b 90 e8 dc 7a 3d 00 65 48 3b 1d 4c 94 80 0b 0f 85 64 fd ff ff RSP: 0018:ffffc900001a8e00 EFLAGS: 00010246 RAX: 0000000000000000 RBX: ffff88811283d700 RCX: ffffffff8174391b RDX: ffff88811956ba00 RSI: ffffffff81743bbb RDI: ffff88811956ba00 RBP: 00000000c0000000 R08: 0000000000000005 R09: 0000000000000000 R10: 00000000c0000000 R11: 0000000000000000 R12: dffffc0000000000 R13: ffff88811956ba00 R14: ffffffff81984efd R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8882687d3000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fe6af2e9d40 CR3: 00000001195d8000 CR4: 00000000003506f0 Call Trace: rcu_do_batch kernel/rcu/tree.c:2617 [inline] rcu_core+0x5a2/0x10d0 kernel/rcu/tree.c:2869 handle_softirqs+0x1de/0x9d0 kernel/softirq.c:622 __do_softirq kernel/softirq.c:656 [inline] invoke_softirq kernel/softirq.c:496 [inline] __irq_exit_rcu+0xed/0x150 kernel/softirq.c:723 irq_exit_rcu+0x9/0x30 kernel/softirq.c:739 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1056 [inline] sysvec_apic_timer_interrupt+0x8f/0xb0 arch/x86/kernel/apic/apic.c:1056 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0010:console_flush_one_record+0xac3/0xe50 kernel/printk/printk.c:3270 Code: 00 e8 51 5a 28 00 9c 5d 81 e5 00 02 00 00 31 ff 48 89 ee e8 5f 62 20 00 48 85 ed 0f 85 d7 01 00 00 e8 71 67 20 00 fb 4c 89 e8 <48> c1 e8 03 42 80 3c 38 00 0f 85 64 03 00 00 48 8b 0c 24 48 8b 6b RSP: 0018:ffffc9000362ea68 EFLAGS: 00000283 RAX: ffffffff89c75f58 RBX: ffffffff89c75f00 RCX: ffffc90012887000 RDX: 0000000000100000 RSI: ffffffff81914f2f RDI: ffff88811956ba00 RBP: 0000000000000000 R08: 0000000000000007 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000012857 R13: ffffffff89c75f58 R14: ffffc9000362eae8 R15: dffffc0000000000 console_flush_all kernel/printk/printk.c:3343 [inline] __console_flush_and_unlock kernel/printk/printk.c:3373 [inline] console_unlock+0x103/0x260 kernel/printk/printk.c:3413 vprintk_emit+0x407/0x6b0 kernel/printk/printk.c:2479 __warn_printf lib/bug.c:190 [inline] __report_bug.cold+0x7b/0x137 lib/bug.c:244 report_bug_entry+0xe1/0x290 lib/bug.c:269 handle_bug+0x1c9/0x2a0 arch/x86/kernel/traps.c:430 exc_invalid_op+0x17/0x50 arch/x86/kernel/traps.c:489 asm_exc_invalid_op+0x1a/0x20 arch/x86/include/asm/idtentry.h:616 RIP: 0010:refcount_warn_saturate+0x111/0x130 lib/refcount.c:25 Code: cc e8 e3 d9 e5 fe 48 8d 3d 4c 70 28 08 67 48 0f b9 3a e8 d2 d9 e5 fe 5b 5d e9 cb 6d 9f 04 e8 c6 d9 e5 fe 48 8d 3d 3f 70 28 08 <67> 48 0f b9 3a e8 b5 d9 e5 fe 5b 5d c3 cc cc cc cc 48 89 df e8 46 RSP: 0018:ffffc9000362ef30 EFLAGS: 00010283 RAX: 00000000000428c1 RBX: ffff88811283d728 RCX: ffffc90012887000 RDX: 0000000000100000 RSI: ffffffff82cbdcda RDI: ffffffff8af44d20 RBP: 0000000000000002 R08: 0000000000000005 R09: 0000000000000004 R10: 0000000000000002 R11: ffff8881f5739708 R12: ffff88810cf18000 R13: ffff88811283d728 R14: 0000000000000001 R15: 0000000000000001 __refcount_add include/linux/refcount.h:289 [inline] __refcount_inc include/linux/refcount.h:366 [inline] refcount_inc include/linux/refcount.h:383 [inline] get_task_struct include/linux/sched/task.h:116 [inline] kthread_stop+0x602/0x680 kernel/kthread.c:786 rsi_kill_thread drivers/net/wireless/rsi/rsi_common.h:78 [inline] rsi_91x_deinit+0x102/0x1f0 drivers/net/wireless/rsi/rsi_91x_main.c:405 rsi_probe+0xd27/0x1aa0 drivers/net/wireless/rsi/rsi_91x_usb.c:861 usb_probe_interface+0x303/0x8f0 drivers/usb/core/driver.c:396 call_driver_probe drivers/base/dd.c:583 [inline] really_probe+0x241/0xa60 drivers/base/dd.c:661 __driver_probe_device+0x1de/0x400 drivers/base/dd.c:803 driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:833 __device_attach_driver+0x1ff/0x3e0 drivers/base/dd.c:961 bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:500 __device_attach+0x1e4/0x4d0 drivers/base/dd.c:1033 device_initial_probe+0xaf/0xd0 drivers/base/dd.c:1088 bus_probe_device+0x64/0x160 drivers/base/bus.c:574 device_add+0x11d9/0x1950 drivers/base/core.c:3689 usb_set_configuration+0xd97/0x1c60 drivers/usb/core/message.c:2210 usb_generic_driver_probe+0xa1/0xe0 drivers/usb/core/generic.c:250 usb_probe_device+0xef/0x400 drivers/usb/core/driver.c:291 call_driver_probe drivers/base/dd.c:583 [inline] really_probe+0x241/0xa60 drivers/base/dd.c:661 __driver_probe_device+0x1de/0x400 drivers/base/dd.c:803 driver_probe_device+0x4c/0x1b0 drivers/base/dd.c:833 __device_attach_driver+0x1ff/0x3e0 drivers/base/dd.c:961 bus_for_each_drv+0x159/0x1e0 drivers/base/bus.c:500 __device_attach+0x1e4/0x4d0 drivers/base/dd.c:1033 device_initial_probe+0xaf/0xd0 drivers/base/dd.c:1088 bus_probe_device+0x64/0x160 drivers/base/bus.c:574 device_add+0x11d9/0x1950 drivers/base/core.c:3689 usb_new_device.cold+0x685/0x115c drivers/usb/core/hub.c:2695 hub_port_connect drivers/usb/core/hub.c:5567 [inline] hub_port_connect_change drivers/usb/core/hub.c:5707 [inline] port_event drivers/usb/core/hub.c:5871 [inline] hub_event+0x314d/0x4af0 drivers/usb/core/hub.c:5953 process_one_work+0x9d7/0x1920 kernel/workqueue.c:3275 process_scheduled_works kernel/workqueue.c:3358 [inline] worker_thread+0x5da/0xe40 kernel/workqueue.c:3439 kthread+0x370/0x450 kernel/kthread.c:467 ret_from_fork+0x6c3/0xcb0 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 ---------------- Code disassembly (best guess): 0: 00 e8 add %ch,%al 2: 51 push %rcx 3: 5a pop %rdx 4: 28 00 sub %al,(%rax) 6: 9c pushf 7: 5d pop %rbp 8: 81 e5 00 02 00 00 and $0x200,%ebp e: 31 ff xor %edi,%edi 10: 48 89 ee mov %rbp,%rsi 13: e8 5f 62 20 00 call 0x206277 18: 48 85 ed test %rbp,%rbp 1b: 0f 85 d7 01 00 00 jne 0x1f8 21: e8 71 67 20 00 call 0x206797 26: fb sti 27: 4c 89 e8 mov %r13,%rax * 2a: 48 c1 e8 03 shr $0x3,%rax <-- trapping instruction 2e: 42 80 3c 38 00 cmpb $0x0,(%rax,%r15,1) 33: 0f 85 64 03 00 00 jne 0x39d 39: 48 8b 0c 24 mov (%rsp),%rcx 3d: 48 rex.W 3e: 8b .byte 0x8b 3f: 6b .byte 0x6b --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup