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Aug 2026 06:33:53 -0700 In-Reply-To: <6a728030.9511d2ce.1fc5b9.035f.GAE@google.com> X-Google-Appengine-App-Id: s~syzkaller X-Google-Appengine-App-Id-Alias: syzkaller Message-ID: <6a7c7641.ac361c09.22ff0a.004a.GAE@google.com> Subject: Re: [syzbot] [kernel?] WARNING in irqentry_exit (2) From: syzbot To: linux-kernel@vger.kernel.org, luto@kernel.org, peterz@infradead.org, syzkaller-bugs@googlegroups.com, tglx@kernel.org Content-Type: text/plain; charset="UTF-8" syzbot has found a reproducer for the following issue on: HEAD commit: f5bbbfec59b4 Merge tag 'probes-fixes-v7.2-rc7' of git://gi.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1723b479580000 kernel config: https://syzkaller.appspot.com/x/.config?x=c44651ea7dd2f307 dashboard link: https://syzkaller.appspot.com/bug?extid=93cc6b9a8a81c9e47978 compiler: gcc (Debian 14.2.0-19) 14.2.0, GNU ld (GNU Binutils for Debian) 2.44 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=174f52c6580000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+93cc6b9a8a81c9e47978@syzkaller.appspotmail.com ------------[ cut here ]------------ __lockdep_enabled && this_cpu_read(hardirqs_enabled) WARNING: ./include/linux/hrtimer_rearm.h:17 at hrtimer_test_and_clear_rearm_deferred_tif include/linux/hrtimer_rearm.h:17 [inline], CPU#0: syz-executor413/6031 WARNING: ./include/linux/hrtimer_rearm.h:17 at hrtimer_rearm_deferred_tif include/linux/hrtimer_rearm.h:52 [inline], CPU#0: syz-executor413/6031 WARNING: ./include/linux/hrtimer_rearm.h:17 at rseq_grant_slice_extension include/linux/rseq_entry.h:236 [inline], CPU#0: syz-executor413/6031 WARNING: ./include/linux/hrtimer_rearm.h:17 at __exit_to_user_mode_loop kernel/entry/common.c:54 [inline], CPU#0: syz-executor413/6031 WARNING: ./include/linux/hrtimer_rearm.h:17 at exit_to_user_mode_loop kernel/entry/common.c:101 [inline], CPU#0: syz-executor413/6031 WARNING: ./include/linux/hrtimer_rearm.h:17 at __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline], CPU#0: syz-executor413/6031 WARNING: ./include/linux/hrtimer_rearm.h:17 at irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:244 [inline], CPU#0: syz-executor413/6031 WARNING: ./include/linux/hrtimer_rearm.h:17 at irqentry_exit_to_user_mode include/linux/irq-entry-common.h:315 [inline], CPU#0: syz-executor413/6031 WARNING: ./include/linux/hrtimer_rearm.h:17 at irqentry_exit+0x718/0xa00 kernel/entry/common.c:165, CPU#0: syz-executor413/6031 Modules linked in: CPU: 0 UID: 0 PID: 6031 Comm: syz-executor413 Not tainted syzkaller #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:hrtimer_test_and_clear_rearm_deferred_tif include/linux/hrtimer_rearm.h:17 [inline] RIP: 0010:hrtimer_rearm_deferred_tif include/linux/hrtimer_rearm.h:52 [inline] RIP: 0010:rseq_grant_slice_extension include/linux/rseq_entry.h:236 [inline] RIP: 0010:__exit_to_user_mode_loop kernel/entry/common.c:54 [inline] RIP: 0010:exit_to_user_mode_loop kernel/entry/common.c:101 [inline] RIP: 0010:__exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline] RIP: 0010:irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:244 [inline] RIP: 0010:irqentry_exit_to_user_mode include/linux/irq-entry-common.h:315 [inline] RIP: 0010:irqentry_exit+0x718/0xa00 kernel/entry/common.c:165 Code: 00 00 00 80 e8 79 f6 57 f6 fb 83 3d 55 fb 66 05 00 74 1a 65 8b 05 78 ba a8 08 85 c0 75 0f 65 8b 05 c9 b5 a8 08 85 c0 74 04 90 <0f> 0b 90 41 f7 c5 00 10 00 00 0f 84 74 fc ff ff f0 41 80 64 24 01 RSP: 0000:ffffc90005a8ff00 EFLAGS: 00010202 RAX: 0000000000000001 RBX: ffffc90005a8ff48 RCX: 0000000000000000 RDX: 0000000000000000 RSI: ffffffff8e1a9419 RDI: ffffffff8c400480 RBP: ffffc90005a8ff38 R08: 0000000000000001 R09: 0000000000000000 R10: 0000000000000001 R11: 0000000000000000 R12: ffff88802b490000 R13: 0000000000001010 R14: 0000001253cc57bd R15: 0000000000000000 FS: 000055555f665400(0000) GS:ffff8880d5dec000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f90fa2f5fe8 CR3: 000000003c93f000 CR4: 0000000000352ef0 Call Trace: asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674 RIP: 0033:0x7f90fa3069ab Code: 00 00 e8 f8 2e 00 00 45 31 c0 31 c9 31 c0 ba 01 00 00 00 be 02 00 00 00 bf 4f 00 00 00 e8 7d de 01 00 85 c0 75 0a c6 43 1c 01 43 1c 01 eb f6 e8 0a 29 00 00 8b 38 e8 33 55 01 00 48 8d 3d 74 RSP: 002b:00007f90fa2f5ff0 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 000055555f6677c0 RCX: 00007f90fa32482a RDX: 0000000000000001 RSI: 0000000000000002 RDI: 000000000000004f RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff875f0e68 R13: 0000000000000002 R14: 00007f90fa3a7cc0 R15: 0000000000000002 --- If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing.