Hello, syzbot found the following issue on: HEAD commit: 1b1934dbbdcf Merge tag 'docs-6.8-2' of git://git.lwn.net/l.. git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1029adbde80000 kernel config: https://syzkaller.appspot.com/x/.config?x=68ea41b98043e6e8 dashboard link: https://syzkaller.appspot.com/bug?extid=06fa1063cca8163ea541 compiler: aarch64-linux-gnu-gcc (Debian 12.2.0-14) 12.2.0, GNU ld (GNU Binutils for Debian) 2.40 userspace arch: arm64 Unfortunately, I don't have any reproducer for this issue yet. Downloadable assets: disk image (non-bootable): https://storage.googleapis.com/syzbot-assets/384ffdcca292/non_bootable_disk-1b1934db.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/00b728a4f3de/vmlinux-1b1934db.xz kernel image: https://storage.googleapis.com/syzbot-assets/5a3fe8452d59/Image-1b1934db.gz.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+06fa1063cca8163ea541@xxxxxxxxxxxxxxxxxxxxxxxxx BUG: scheduling while atomic: syz-executor.0/29225/0x00000002 Modules linked in: CPU: 1 PID: 29225 Comm: syz-executor.0 Not tainted 6.7.0-syzkaller-10085-g1b1934dbbdcf #0 Hardware name: linux,dummy-virt (DT) Call trace: dump_backtrace+0x94/0xec arch/arm64/kernel/stacktrace.c:291 show_stack+0x18/0x24 arch/arm64/kernel/stacktrace.c:298 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x48/0x60 lib/dump_stack.c:106 dump_stack+0x18/0x24 lib/dump_stack.c:113 __schedule_bug+0x50/0x68 kernel/sched/core.c:5943 schedule_debug kernel/sched/core.c:5970 [inline] __schedule+0x7f4/0x8a8 kernel/sched/core.c:6620 __schedule_loop kernel/sched/core.c:6802 [inline] schedule+0x34/0xc8 kernel/sched/core.c:6817 schedule_timeout+0x8c/0x100 kernel/time/timer.c:2183 do_wait_for_common kernel/sched/completion.c:95 [inline] __wait_for_common kernel/sched/completion.c:116 [inline] wait_for_common kernel/sched/completion.c:127 [inline] wait_for_completion_timeout+0x74/0x16c kernel/sched/completion.c:167 drm_atomic_helper_wait_for_flip_done+0x6c/0xc4 drivers/gpu/drm/drm_atomic_helper.c:1719 vkms_atomic_commit_tail+0x60/0xd0 drivers/gpu/drm/vkms/vkms_drv.c:81 commit_tail+0xa4/0x18c drivers/gpu/drm/drm_atomic_helper.c:1832 drm_atomic_helper_commit+0x164/0x178 drivers/gpu/drm/drm_atomic_helper.c:2072 drm_atomic_commit+0xa8/0xe0 drivers/gpu/drm/drm_atomic.c:1514 drm_client_modeset_commit_atomic+0x210/0x270 drivers/gpu/drm/drm_client_modeset.c:1051 drm_client_modeset_commit_locked+0x5c/0x188 drivers/gpu/drm/drm_client_modeset.c:1154 drm_client_modeset_commit+0x30/0x58 drivers/gpu/drm/drm_client_modeset.c:1180 __drm_fb_helper_restore_fbdev_mode_unlocked drivers/gpu/drm/drm_fb_helper.c:251 [inline] __drm_fb_helper_restore_fbdev_mode_unlocked+0xa8/0xe8 drivers/gpu/drm/drm_fb_helper.c:230 drm_fb_helper_set_par+0x30/0x4c drivers/gpu/drm/drm_fb_helper.c:1344 fb_set_var+0x21c/0x488 drivers/video/fbdev/core/fbmem.c:312 fbcon_switch+0x214/0x4d0 drivers/video/fbdev/core/fbcon.c:2110 flush_scrollback drivers/tty/vt/vt.c:912 [inline] csi_J+0x254/0x260 drivers/tty/vt/vt.c:1527 do_con_trol drivers/tty/vt/vt.c:2408 [inline] do_con_write+0x1a30/0x1e2c drivers/tty/vt/vt.c:2905 con_write+0x18/0x68 drivers/tty/vt/vt.c:3251 gsmld_write+0x64/0xd0 drivers/tty/n_gsm.c:3724 iterate_tty_write drivers/tty/tty_io.c:1021 [inline] file_tty_write.constprop.0+0x134/0x28c drivers/tty/tty_io.c:1092 tty_write+0x14/0x20 drivers/tty/tty_io.c:1113 call_write_iter include/linux/fs.h:2085 [inline] new_sync_write fs/read_write.c:497 [inline] vfs_write+0x1dc/0x2f4 fs/read_write.c:590 ksys_write+0x70/0x104 fs/read_write.c:643 __do_sys_write fs/read_write.c:655 [inline] __se_sys_write fs/read_write.c:652 [inline] __arm64_sys_write+0x1c/0x28 fs/read_write.c:652 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline] invoke_syscall+0x48/0x114 arch/arm64/kernel/syscall.c:51 el0_svc_common.constprop.0+0x40/0xe0 arch/arm64/kernel/syscall.c:136 do_el0_svc+0x1c/0x28 arch/arm64/kernel/syscall.c:155 el0_svc+0x34/0xd8 arch/arm64/kernel/entry-common.c:678 el0t_64_sync_handler+0x100/0x12c arch/arm64/kernel/entry-common.c:696 el0t_64_sync+0x19c/0x1a0 arch/arm64/kernel/entry.S:595 BUG: scheduling while atomic: syz-executor.0/29225/0x00000000 Modules linked in: CPU: 0 PID: 29225 Comm: syz-executor.0 Tainted: G W 6.7.0-syzkaller-10085-g1b1934dbbdcf #0 Hardware name: linux,dummy-virt (DT) Call trace: dump_backtrace+0x94/0xec arch/arm64/kernel/stacktrace.c:291 show_stack+0x18/0x24 arch/arm64/kernel/stacktrace.c:298 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x48/0x60 lib/dump_stack.c:106 dump_stack+0x18/0x24 lib/dump_stack.c:113 __schedule_bug+0x50/0x68 kernel/sched/core.c:5943 schedule_debug kernel/sched/core.c:5970 [inline] __schedule+0x7f4/0x8a8 kernel/sched/core.c:6620 __schedule_loop kernel/sched/core.c:6802 [inline] schedule+0x34/0xc8 kernel/sched/core.c:6817 futex_wait_queue+0x70/0x9c kernel/futex/waitwake.c:370 __futex_wait+0xc8/0x15c kernel/futex/waitwake.c:669 futex_wait+0x84/0x108 kernel/futex/waitwake.c:697 do_futex+0xf8/0x1a0 kernel/futex/syscalls.c:102 __do_sys_futex kernel/futex/syscalls.c:179 [inline] __se_sys_futex kernel/futex/syscalls.c:160 [inline] __arm64_sys_futex+0x7c/0x1a4 kernel/futex/syscalls.c:160 __invoke_syscall arch/arm64/kernel/syscall.c:37 [inline] invoke_syscall+0x48/0x114 arch/arm64/kernel/syscall.c:51 el0_svc_common.constprop.0+0x40/0xe0 arch/arm64/kernel/syscall.c:136 do_el0_svc+0x1c/0x28 arch/arm64/kernel/syscall.c:155 el0_svc+0x34/0xd8 arch/arm64/kernel/entry-common.c:678 el0t_64_sync_handler+0x100/0x12c arch/arm64/kernel/entry-common.c:696 el0t_64_sync+0x19c/0x1a0 arch/arm64/kernel/entry.S:595 --- 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@xxxxxxxxxxxxxxxx. 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
