syzbot has found a reproducer for the following issue on: HEAD commit: a41a877bc12d Merge branch 'for-next/fixes' into for-kernelci git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci console output: https://syzkaller.appspot.com/x/log.txt?x=104eb875080000 kernel config: https://syzkaller.appspot.com/x/.config?x=5cea15779c42821c dashboard link: https://syzkaller.appspot.com/bug?extid=775a3440817f74fddb8c compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2 userspace arch: arm64 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=15aebce7080000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=167b5e33080000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+775a3440817f74fddb8c@xxxxxxxxxxxxxxxxxxxxxxxxx Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000 Mem abort info: ESR = 0x0000000086000004 EC = 0x21: IABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x04: level 0 translation fault user pgtable: 4k pages, 48-bit VAs, pgdp=0000000109ee4000 [0000000000000000] pgd=0000000000000000, p4d=0000000000000000 Internal error: Oops: 86000004 [#1] PREEMPT SMP Modules linked in: CPU: 1 PID: 3045 Comm: syz-executor330 Not tainted 6.0.0-rc2-syzkaller-16455-ga41a877bc12d #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : 0x0 lr : folio_mark_dirty+0xbc/0x208 mm/page-writeback.c:2748 sp : ffff800012783970 x29: ffff800012783970 x28: 0000000000000000 x27: ffff800012783b08 x26: 0000000000000001 x25: 0000000000000400 x24: 0000000000000001 x23: ffff0000c736e000 x22: 0000000000000045 x21: 05ffc00000000015 x20: ffff0000ca7403b8 x19: fffffc00032ec600 x18: 0000000000000181 x17: ffff80000c04d6bc x16: ffff80000dbb8658 x15: 0000000000000000 x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000000 x11: ff808000083e9814 x10: 0000000000000000 x9 : ffff8000083e9814 x8 : 0000000000000000 x7 : 0000000000000000 x6 : 0000000000000000 x5 : ffff0000cbb19000 x4 : ffff0000cb3d2000 x3 : ffff0000cbb18f80 x2 : fffffffffffffff0 x1 : fffffc00032ec600 x0 : ffff0000ca7403b8 Call trace: 0x0 set_page_dirty+0x38/0xbc mm/folio-compat.c:62 f2fs_update_meta_page+0x80/0xa8 fs/f2fs/segment.c:2369 do_checkpoint+0x794/0xea8 fs/f2fs/checkpoint.c:1522 f2fs_write_checkpoint+0x3b8/0x568 fs/f2fs/checkpoint.c:1679 f2fs_issue_checkpoint+0x1b0/0x234 f2fs_sync_fs+0x8c/0xc8 fs/f2fs/super.c:1651 sync_filesystem+0xe0/0x134 fs/sync.c:66 generic_shutdown_super+0x38/0x190 fs/super.c:474 kill_block_super+0x30/0x78 fs/super.c:1427 kill_f2fs_super+0x140/0x184 fs/f2fs/super.c:4544 deactivate_locked_super+0x70/0xd4 fs/super.c:332 deactivate_super+0xb8/0xbc fs/super.c:363 cleanup_mnt+0x1f8/0x234 fs/namespace.c:1186 __cleanup_mnt+0x20/0x30 fs/namespace.c:1193 task_work_run+0xc4/0x208 kernel/task_work.c:177 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline] do_notify_resume+0x174/0x1d0 arch/arm64/kernel/signal.c:1127 prepare_exit_to_user_mode arch/arm64/kernel/entry-common.c:137 [inline] exit_to_user_mode arch/arm64/kernel/entry-common.c:142 [inline] el0_svc+0x9c/0x150 arch/arm64/kernel/entry-common.c:625 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:642 el0t_64_sync+0x18c/0x190 Code: bad PC value ---[ end trace 0000000000000000 ]---
